#include<iostream>
using namespace std;
int main()
{
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    if(a>b&&b>c&&c>d)cout<<"Fish Diving"<<endl;
    else if(d>c&&c>b&&b>a)cout<<"Fish Rising"<<endl;
    else if(a==b&&b==c&&c==d)cout<<"Fish At Constant Depth"<<endl;
    else cout<<"No Fish"<<endl;
    return 0;
}
